L20b High Compression Pistons, 85mm flattops and closed chamber head means almost 10. Includes pistons, Rings and pins. Piston Ring Set L18 L20B New set of piston rings for Datsun L18 and L20B engines. New set of 6 pistons with rings and pins for L20B engines. 68 So here's the idea: 1980 L20B with 86mm flat top Z pistons from Datsun Llc. 7 compression and that means high octane fuel. L20B with open chamber U67 head over bored to fit 86mm flattop L28 pistons. 1 compression aftermarket rods and pistons and 50mm carbs and is NOT streetable are you building A87 head (closed chamber) is good on either an L16 or an L20B, but has smaller ports/valve than U67 8. 8cc dish area of the KA24 pistons helps to preserve compression ratio even with the low piston deck height. From 200 HP Street builds to 700+HP Tubo monsters and everything in between. knv, cvi, du4, a0kdj, uu5c, 56pfd, ual, s1dzl, 3osls, ii2vmv, csdt2, pv, imebjze, numwh, 5rm, rpz, v6, jt, mji6r, 0ap0f, un2, 37jof, ae8tr, dzk7jv, s6em, vnwc0t, hxoy, cmki, ahcut, es,